A search-and-rescue operation had been under way for the fifth crew member, but on Thursday afternoon, the Coast Guard announced it was calling off the effort.

The announcement came hours after parts of the helicopter were found. U.S. Navy officials said the fuselage, where the missing sailor was likely stuck, had not yet been located, but other parts of the helicopter had been.

The two surviving crew members were taken to Sentara Norfolk General Hospital; one was listed in serious condition on Thursday, and one in fair condition, according to NBC Virginia affiliate WAVY.com.

None of the crew members' identities were released.

The MH-53E was conducting a routine training mission when it made the emergency water landing about 20 nautical miles east of Virginia Beach, a U.S. Navy official said. It was conducting the training mission in tandem with another MH-53E at the time.

The Navy said it took about a half hour to rescue the first two sailors after a distress call went out at around 10:45 a.m., reported WAVY.com. The other two sailors were rescued within an hour of the distress call.

Nearby Coast Guard assets were first to respond when the helicopter went down. U.S. Navy helicopters responded soon after to help with the search and rescue of the missing sailors.

The aircraft is part of the Helicopter Mine Countermeasures Squadron, based at Naval Air Station Norfolk.